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NEW QUESTION 44
The difference between $push and $addToSet is:

• A. $addToSet adds the item to the field only if the new item is of the same datatype
• B. $addToSet needs the fields to be already present while $push will work even if the field is not present
• C. $addToSet adds the item to the field only if it does not exist already; while $push pushes the item to the field irrespective of whether it was present or not
• D. There is no major difference between them. $addToSet is a deprecated version of $push.

Answer: C

NEW QUESTION 45
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.

Answer:

Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )

NEW QUESTION 46
As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:

• A. Providing these parameters in any order does not impact the performance
• B. $match moves before $sort
• C. $sort moves before $match
• D. MongoDB does not do any movements by default and will use the order provided

Answer: B

NEW QUESTION 47
What read preference should your application use if you want to read from the primary under normal circumstances but allow reads from secondaries when a primary is unavailable?

• A. nearest
• B. secondaryPreferred
• C. primaryPreferred
• D. primary
• E. Secondary

Answer: C

NEW QUESTION 48
Consider the following example document from the sample collection. All documents in this collection have the same schema.

Which of the following queries will replace this with the document.

• A. db.sample.update( { "_id" : 3 > , { "_id" : 7 , "c" : 4 > , { "justOne" : true > ) / This operation cannot be done with a single query.
• B. db.sample.update( { "_id" : 3 > , { "_id" : 7 , "c" : 4 > )
• C. db.sample.update( { "_id" : 3 > , { "_id" : 7 , "c" : 4 , { "$unset" : [ "a" , "b" ] } } )
• D. db.sample.update( { "_id" : 3 } , { "$set" : { "_id" : 7 , "c" : 4 > > )

Answer: C

NEW QUESTION 49
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